Setup Sliding-Sync V3! Element X does seem to be a bit early, but still nice

flake.lock

@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1694643239,
-        "narHash": "sha256-pv2k/5FvyirDE8g4TNehzwZ0T4UOMMmqWSQnM/luRtE=",
+        "lastModified": 1696940889,
+        "narHash": "sha256-p2Wic74A1tZpFcld1wSEbFQQbrZ/tPDuLieCnspamQo=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "d9b88b43524db1591fb3d9410a21428198d75d49",
+        "rev": "6bba64781e4b7c1f91a733583defbd3e46b49408",
         "type": "github"
       },
       "original": {
@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1694767346,
-        "narHash": "sha256-5uH27SiVFUwsTsqC5rs3kS7pBoNhtoy9QfTP9BmknGk=",
+        "lastModified": 1696879762,
+        "narHash": "sha256-Ud6bH4DMcYHUDKavNMxAhcIpDGgHMyL/yaDEAVSImQY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ace5093e36ab1e95cb9463863491bee90d5a4183",
+        "rev": "f99e5f03cc0aa231ab5950a15ed02afec45ed51a",
         "type": "github"
       },
       "original": {

flake.nix

@@ -581,6 +581,15 @@
                   #  port = 8888;
                   #};
 
+                  services.matrix-synapse.sliding-sync = {
+                    enable = true;
+                    createDatabase = true;
+                    environmentFile = "/var/lib/private/matrix-sliding-sync/secrets";
+                    settings = {
+                      SYNCV3_SERVER="https://synapse.room409.xyz";
+                    };
+                  };
+
                   services.matrix-synapse = {
                       enable = true;
 
@@ -708,7 +717,7 @@
                           locations."/.well-known/matrix/client".extraConfig = ''
                               add_header Content-Type application/json;
                               add_header Access-Control-Allow-Origin *;
-                              return 200 '{ "m.homeserver": {"base_url": "https://synapse.room409.xyz"}, "m.identity_server":  { "base_url": "https://vector.im"} }';
+                              return 200 '{ "m.homeserver": {"base_url": "https://synapse.room409.xyz"}, "org.matrix.msc3575.proxy": { "url": "https://syncv3.room409.xyz" }, "m.identity_server":  { "base_url": "https://vector.im"} }';
                           '';
                           locations."/".proxyPass = "http://localhost:8008";
                           locations."/".extraConfig = ''
@@ -716,6 +725,11 @@
                               proxy_set_header X-Forwarded-For $remote_addr;
                           '';
                       };
+                      virtualHosts."syncv3.room409.xyz" = {
+                          forceSSL = true;
+                          enableACME = true;
+                          locations."/".proxyPass = "http://localhost:8009";
+                      };
 
                       virtualHosts."element-synapse.room409.xyz" = {
                           forceSSL = true;